Mid-construction geometry shifts on bridges

And anyone else deal with a late survey showing a 20 mm pier offset after the first girders arrive? I’m the bridge engineer managing both design and construction on a 120 m steel plate girder over I-82, and we ended up moving a field splice and retuning camber with the fabricator to keep a weekend closure — curious where you draw the line between reopening the calc package vs solving it in the field.

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On jobs like that I bake a deviation matrix into the erection plan: up to ±25 mm we can shift a field splice, swap in 10 mm shim packs at bearings, and tweak camber per NSBA tolerances without reopening global calcs. Did you have slotted splice holes or adjustable sole plates given the “20 mm” offset? Steel’s forgiving; schedules aren’t.

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